2. MAMMOTH CAVE

At Mammoth Cave National Park, the ghost of Stephen Bishop, a slave and Mammoth Cave explorer who is buried nearby, is said to make occasional appearances. In the 19th century, Mammoth was also the site of a failed tuberculosis hospital; today, you can now reportedly hear the coughs of patients who perished while being treated.

3. GREAT SMOKY MOUNTAINS

The Norton Creek Trail in the Great Smoky Mountains is home to the legend of Spearfinger, a witch who'd disguise herself as an old woman, snatch children, and use her obsidian stone finger to cut out their livers, which she considered a delicacy. Another legend chronicles a man who was murdered while looking for his daughter, and now manifests as a light that leads hikers.

4. GRAND CANYON

The “Wailing Woman” haunts the Transept Trail at Grand Canyon National Park. According to legend, she committed suicide there in the 1920s after hearing that her husband and son had died while hiking. She floats around the trail in a white dress with blue flowers on stormy nights, slamming doors and haunting the Grand Canyon Lodge.

5. NEW JERSEY PINELANDS

At Batona Trail in the New Jersey Pinelands National Reserve, the Jersey Devil can be heard screaming at night—though it’s much better to hear him than to see him. The creature is said to have the head of a dog, bat wings, horns and forked tail.

6. YOSEMITE

The cries of another tragic figure haunt Grouse Lake in Yosemite National Park. Legend has it that a Native American boy who drowned in the lake calls out to hikers for help. America’s first park ranger, Galen Clark, heard the cries in 1857 and assumed they were from a lost dog. When he asked a band of Native American hunters about it that evening, they informed Clark of the story.

The Miwok Indians also believe that Yosemite’s waterfalls are haunted by an evil wind called Po-ho-no. The wind draws people to the edge and pushes them off. And the spooky legends surrounding Yosemite don’t stop there: The Ahwahnee Hotel is supposedly haunted, and the entire Tenaya Canyon was cursed by Chief Tenaya in 1851 when the U.S. Cavalry forced his tribe off their land.

7. GETTYSBURG

Battlefields, not surprisingly, often possess their own haunted histories. At Devil’s Den, a hill in Gettysburg National Military Park, a barefoot ghost known as the “Tennessean” or “The Hippie” will point toward the Plum Run stream and say, “What you’re looking for is over there,” before disappearing.

8. CRATER LAKE

The Klamath Indians consider Crater Lake—a caldera and the deepest body of water in the U.S.—a sacred place. A legend states that it holds a spirit named Llao who was thrown into the lake by another spirit called Skell and devoured by monsters. In 2002, a tourist in a rowboat reported seeing an enormous creature swimming underneath her vessel. What’s more, rangers regularly spot campfires on the lake’s Wizard Island, but find no evidence of people or a fire when they go to investigate. (It’s possible that Bigfoot or Sasquatch are to blame for those.)

9. YELLOWSTONE

Old Faithful in Yellowstone National Park is also supposedly haunted. According to legend, a bride who was decapitated on her honeymoon now strolls around with her head tucked under her arm. Another woman in 1890s fashions has appeared floating at the foot of a bed in Room Number 2 at the Old Faithful Inn, and one worker reported seeing a fire extinguisher spin all by itself in the hallway.

10. HAWAII VOLCANOES

Pele—the volcano goddess, not the soccer player—inflicts severe punishment on anyone who steals from her during visits to Hawaii Volcanoes National Park. Every year, tourists walk off with souvenirs in the form of volcanic rocks, and more than a few of them seem to experience negative consequences afterward. In fact, thousands of pounds of mail addressed to “Queen Pele” are returned every year, begging her to lift the curse on them.

In 1906, the Antiquities Act was established to preserve “historic landmarks, historic and prehistoric structures, and other objects of historic or scientific interest.” Nearly 130 such national monuments are recognized today, but their status isn’t as safe as nature lovers might hope. In an effort to ensure protected sites stay protected, 9-year-old Robbie Bond launched a nonprofit called Kids Speak for Parks.

As the Huffington Post reports, Robbie formed the group after learning that 27 national monuments are under threat from the U.S. government. The president issued two executive orders in April, calling for a review of a list of monuments to see if they should be stripped of their titles. The Vermillion Cliffs, the Sonoran Desert, and Papahānaumokuākea in Robbie’s home state of Hawaii could all be made vulnerable under the initiative.

Robbie believes these monuments shouldn’t be messed with, and he’s spreading his message of conservation by visiting all 27 of them. He and his parents have made stops at Carrizo Plain and Giant Sequoia in California and Bears Ears national monument in Utah so far and they plan to visit sites in Nevada and New Mexico next. Along the way, Robbie will be sharing photos and updates from his journey with hopes of inspiring an "army of fourth graders" to join his crusade.

"You can’t get the parks back once they’ve been taken away, and I want our national parks and monuments to be available for my kids and for future generations," Robbie said in a video announcing the project.

Around 1912, naturalist/explorer/national parks advocate John Muir sent four sequoia seedlings to a forester friend in Boise, Idaho. Only one of those trees still remains in the city today, and after standing in the same spot for a century, it’s about to get a change of scenery.

As the Associated Press reports, St. Luke’s Health System is spending $300,000 to move the sequoia two blocks away to make room for the expansion of a hospital. Weighing 800,000 pounds and towering 10 stories above the ground, the workers tasked with moving the tree have their work cut out for them. The relocation project will start the afternoon of Friday, June 23 with the tree company lifting the six-foot thick trunk from the ground and placing it onto a rig of inflatable, rolling tubes. The tree will begin its two-block journey at midnight Saturday and is expected to arrive at its new home on city property 12 hours later.

The company has never transported a tree this size, but they estimate their chances of success to be 95 percent. If the tree doesn’t survive the trip, the city will lose a piece of its history. St. Luke’s realized this when laying out their construction plans—hospital spokeswoman Anita Kissée told the AP that cutting it down “was never an option.”

While sequoias have evolved to withstand fire and disease, laying down roots in a new place is sure to put stress on the behemoth. The relocation crew plans to transplant the soil currently supporting the roots as well to increase the tree's likelihood of surviving for centuries to come.